[PATCH v6 0/2] Add HARDLOCKUP_DETECTOR_PERF support for RISC-V

[Doug Anderson]

Hi,

On Thu, Nov 13, 2025 at 7:33 PM Yunhui Cui <cuiyunhui at bytedance.com> wrote:
>
> After discussion [1],[2], hardlockup_perf cannot be completely replaced by
> the hardlockup_buddy approach, so this patch is still being submitted.
>
> v1->v2:
> The contents of arch/arm64/watchdog_hld.c are directly consolidated into
> kernel/watchdog_perf.c.
>
>
> v2->v3:
> Add CONFIG_WATCHDOG_PERF_ADJUST_PERIOD to enclose the period update logic,
> select it by default on arm64 and riscv, without affecting other arches
> like x86 and PPC.
>
> v3->v4:
> Place the line "select WATCHDOG_PERF_ADJUST_PERIOD if HARDLOCKUP_DETECTOR_PERF && CPU_FREQ"
> in the Kconfig files for arm64 and riscv in one line, with no line breaks.
>
> v4->v5:
> Remove __weak from hw_nmi_get_sample_period()
>
> v5->v6:
> Removed the dependency on CPU_FREQ for WATCHDOG_PERF_ADJUST_PERIOD in Kconfig, which fixes the
> issue reported at: https://lore.kernel.org/oe-kbuild-all/202510240701.eB6r97V3-lkp@intel.com/

I haven't tried compiling this myself, but it seems like an OK
solution for the compile-time error to me.

-Doug